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HousecatHST
EC = external cup
44 = inside diameter of the headtube
40,30 = inside diameter of the bearing. 40 for 1-1/2", 30 for 1-1/8"
So presumably ec44/40,30 is a 1-1/2" lower cup to fit a 1-1/8" steerer so yes you would just need a new crown race, I think
You don't normally see both diameters on one option